Intermittent starting issues
Recently acquired a C230 from 06/07 with aprox 165000km (102 526 miles).
(M272E25 engine and 722.9 7-speed gearbox.)
Recently, it started acting up when standing still for more than 4-6 hours.
Long cranks, but it always starts.
I suspected it was fuel related because I tried turning the ignition on for 5 seconds and then off then on again, and it started like normal. Decided to change the fuel filter (which was in a pretty rough shape) and the fuel pump. It was starting fine for a couple of days, but now it's long cranking pretty much every time when it's been standing still.
Don't really have access to a diagnostics tool, so I decided to check here if anyone else has had similar issues.
I have my suspects in the camshaft sensor, crankshaft sensor, and coolant temperature sensor.